Spin-lattice relaxation in phase separated solid 3He- 4 solution He
N. P. Mikhin, A. V. Polev, E. Ya. Rudavskii, and V. A. Shvarts
B.Verkin Institute for Low Temperature Physics and Engineering, 47 Lenin Ave., 310164, Kharkov, Ukraine
( Submitted November 14, 1996 )
The spin-lattice relaxation time in a mixture with the 3.18% 3He initial concentration is measured by a pulsed NMR technique at a frequency of 250kHz during phase separation. The relaxation time in the concentrated bcc phase is found to differ substantially from that in the initial mixture and is independent of temperature in the whole range of its existence. It is shown that relaxation is governed by the Zeeman-exchange mechanism. In a dilute hcp daughter phase the relaxation time increases on cooling as T1~x-n, where n=0.88+/-0.12, x is the 3He concentration. T1 values coincide with known ones of corresponding homogeneous mixtures.